Ignition coil



Aug. 15, 1944.

H. L. HARTZELL IGNITION COIL Original Filed Sept. 28, 1959 INVENTOR a m w 4 M M m fl Mum rj v v ATTOR N EYS Patented Aug. 15, 1944 UNITED STATES PATENT OFFICE IGNITION COIL Herman L. Hartzell, Anderson, Ind., assignor to General Motors Corporation; Detroit, Mich, a corporation of Delaware Original application September 28, 1939, Serial No. 296,906. Divided and this application February 5, 1942, Serial No. 429,677

1 Claim.

(Cl. N L-153) Fig. 2 is an enlarged detail View in section showing the construction of one of the terminals.

With specific reference to the drawing, I rehermetically sealed to insure against fluid flow 5 fers to a sheet metal coil case having a longitudithrough any of the junctures of the enclosing nal lock seam and being closed at each end by easing or through any of the circuit terminal members l4 and It. Member 14 supports cirmountings. The instant application is a division cuit terminals as i8 and 25. End member it of a copending application S, N. 296,906 to Hersupports terminal 22. Enclosed within the casman L. Hartzell and Dalphin L. Hittle for Igni- 1o ing is a coil assembly unit 24, including a bundle tion coil, filed September 28, 1939 patented May of core wires 25 supporting a secondary winding 19, 1942, as 2,283,733 and relates to terminal 2'! and about which is wound a primary winding structure suitable for coils disclosed in the 00- 28. A lead from the inside end of the seconda y pending application of Herman L. Hartzell, Sewinding 2! is tucked in between the core Wires 26 rial No. 296.90% filed September 28, 1939, which in the usual manner, and the outside secondary issued August 24, 1943 as 2,317,784. winding lead and the inside primary winding lead It is an object of the present invention to proare twisted together and fastened by a clip 30, vide certain improvements in the type of coil disfrom which a lead 32 makes connection with the closed in the Hartzell application referred to, primary terminal The Outside End f the with the aim to reduce the cost of manufacture mary winding is joined to a lead 34 by a clip 35, of coils having fluid tight enclosures, in which and this lead is secured to the other primary the coil body can be properly located so that the terminal 20. The end members 14 and [6 may impregnant may be introduced through a termibe secured to the ends of the case member ID, in nal structure, later sealed, and by which the imany desired manner that will effect a sealed juncpregnant can reach all parts of the enclosure ture, but it is preferred that this be accomand the voids of the assembly. plished by a double rolled seam incorporating a A further object of the invention is to improve asket of oil and heat resistant material, such the means for providing a fluid tight seal beas rubber or latex bonded cork. Seam junctures tween the coil container of thin sheet metal and of that type are indicated at 36 and 38, by which the high tension terminal of porcelain. the end members I and iii are each secured to A further object is to provide a terminal strucone end of the case l0. Contributing to that type ture for mounting in an aperture of a thin walled of seam each of the end members initially has sealed casing member, and which will accomplish an open rolled edge 40 (Fig. 2) that is finally ina seal against fluid flow through the mounting. terlocked with the end of the case l0.

Another object is to provide a through termi- The specific construction of the end member nal for a metallic wall member with insulating I6 is illustrated in Fig. 2, where it will be seen means for sealing the terminal support against that the member has a raised rim 42 bounding fluid flow therethrough. which is the open roll 40. Centrally of member A still further object is to provide an insu- Hi there is'a depressed portion 44 that is aperlated mounting for a through terminal on a tured at 46 for reception of a high tension tercasing, that will aiford charging of the casing minal insulator 48 having a flange 50. The in- With an impregnant and sealing of the casing sulator 48 is of porcelain or like material and to prevent any leakage thereof though casing is terminates inside of the member IS with 2, cysubject to differentials of pressure within and lindrical portion 52, there being a longitudinal without. bore or passage 54 therethrough, which is re- Further objects and advantages of the present duced at 56, the outside end. A compressible invention will be apparent from the following gasket 58 of oil and heat resisting characterisdescription, reference being had to the accomtics is disposed over the cylindrical portion 52 panying drawing wherein a preferred embodiof the insulator and occupies a position between ment of the present invention is clearly shown. the flange 50 and the depressed portion 44 of the In the drawing:

Fig. 1 is a view partly in elevation and partly in section, illustrating the instant invention substantially as indicated by the line and arrows l| of Fig. 2.

member l6. Then a ring 60 of porcelain or the like is placed over the cylindrical portion 52 of the insulator which it closely fits and is pressed against the inside surface or the bottom wall of the depression 44. The outside diameter of the part 52 is of a dimension to closely fit the apertures of the member IS, the gasket 58 and the ring 60.

These parts I6, 48 and 60 are held in fluid tight relation by means of a terminal assembly consisting of a tubular member 62 in the outside end of which is secured a hollow terminal tip 64, which may be accomplished by hydrogenbrazing or the like. The tip 64 has a longitudinal bore 68 and an external annular shoulder or flange 68 which fits against the end of the tube 62 where it is secured in fluid tight relation by the brazing or otherwise. This terminal construction is inserted from the outside and through the bore 56 and of the insulator so as to extend beyond the inside end of the cylindrical portion 52, a gasket T0 of oil and heat resistant material being disposed over the outer end of the tube 62 and against the flange 68, where it seats in an end depression 12 in the end of the insulator 48. Over the inside end of the tube 62 there is disposed a rigid insulating washer N that rests against the end of the cylindrical portion 52 and engages at its periphery the inside wall 76 of the insulator ring 63. The insulator i4 is of such rigidity as to hold the end of the tube 62 centrally oi the ring and thereby equalize the tension of the final assembly. To secure these parts resiliently in the assembled relation, one or more spring steel dished washers '58 are placed over the end or" the tube 62 and pressed or oly against the end Gr the ring 83 where they a-e held until the end of the tube 62 is spun over as at or otherwise expanded in a riveting relation to engage and compress the spring washers 58. That procedure somewhat flattens out the dished washers 8 compresses the gaskets and into fluid tight relation between rigid parts of the assembly, and provides a tubular terminal member extending from end to end of the insulator 48, while insulatingly supporting the terminal member by the end member 36.

The high tension terminal member 22 being secured in this fashion, the end member I6 is placed over the end of the case l0 where the open roll 40 of the end member and the end of the case are secured together as indicated at 38 in Fig. 1. The partly closed casing is now ready for reception of the coil parts completing the assembly.

While the embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming Within the scope of the claim which follows.

What is claimed is as follows:

An electric terminal for through mounting in a metallic case member having an aperture therein, the combination comprising, a tubular insulator having a stepped bore and a radial eX- terior flange near one end to provide a cylindri cal shouldered extension adapted to extend through the case aperture, a sealing gasket of heat and oil resistant material carried by the cylindrical portion of the insulator and disposed between the shoulder of the flange and the case member, an insulator ring surrounding the cylindrical extension of the tubular insulator and disposed against the case member, a conductive element extending throughout the length of the tubular insulator and having a radially extending portion anchored in the larger portion of the stepped bore, a gasket of heat and oil resistant material between the insulator and the said radial portion of the conductive element, a dished spring washer surrounding the other end of th conductive element and pressing peripherally against the said insulator ring, and means including an offset portion of the conductive element flexing the spring washer for compressing both said gaskets into sealing relation against oppositely disposed portions of the tubular insulator.

HERMAN L. HAR'IZELL. 

